毕业设计论文 基于JAVA局域网聊天软件

本科毕业论文（毕业设计）

题目：局域网聊天

摘要

在网络越来越发达的今天，人们对网络的依赖越来越多，越来越离不开网络，由此而产生的聊天工具越来越多，例如，国外的ICQ、国内腾讯公司开发的OICQ。基于Java网络编程的强大功能，本次毕业设计使用Java编写一个聊天系统。

一般来说，聊天工具大多数由客户端程序和服务器程序外加服务器端用于存放客户数据的数据库组成，本系统采用客户机/服务器架构模式通过Java提供的Socket类来连接客户机和服务器并使客户机和服务器之间相互通信，由于聊天是多点对多点的而Java提供的多线程功能用多线程可完成多点对多点的聊天，数据库管理系统用SQL Server2000完成并通过JDBC-ODBC桥访问数据库。

本系统建立在JAVA平台上，系统的设计使用了面向对象技术和面向对象的设计原则。系统采用C/S结构，客户端与客户端以及客户端与服务器端之间通过Socket传送消息。使用JAVA语言编写，开发工具采用Eclipse。服务器端设计与实现过程中，采用了多线程技术，可以在单个程序当中同时运行多个不同的线程，执行不同的任务。大大增强了程序对服务器资源的利用。

聊天系统完成后将可进行多人对多人的聊天，对好友进行添加、删除，对新用户的注册，发送消息、接受消息等等功能。

关键字：多线程；客户机/服务器；JA V A ；Socket ；Eclipse ；TCP/IP

Abstract

as the network become more and more developed, people become more and more lean to the network, and can not leave with out it. This caused the chat materials become more numerous, as the overseas ICQ system, the OICQ system that invented by Tencent Co., and so on. So we create a network chat medium just like the QQ.Java network programming based on the power, the use of Java designed to prepare graduates a chat system.

In general, the majority of the chat tool for client and server program in addition to server-side storage of customer data for the database,the system uses a client / server architecture model the adoption of Java provided Socket class connect client and server and between the client and server communicate with each other, as the chat is to provide point-to-multipoint and multi-threaded Java function to be completed by using multi-threaded chat and more point-to-multipoint, database management system with SQL Server2000 the completion and adoption of

JDBC-ODBC Bridge access the database.

The system built on the JAVA platform, the system design using

object-oriented technology and object-oriented design principles. System uses the C / S structure, client and client-side and server-side client and send messages through Socket. The use of JAVA language, development tools using Eclipse. Design and Implementation of server-side process, the use of multi-threading technology, which can process in a single run at the same time a number of different threads, the implementation of different tasks. Procedures greatly enhanced the use of server resources.

Chat system will allow people to complete chat to more friends，and the system can add, delete somebody，can deal with new user registration, send messages, receive messages and so on.

Keywords : Multithreading ; Client/Server ;JA V A ;Socket ;Eclipse ;TCP/IP

目录

1 绪论 ......................................................................................................... 错误！未定义书签。1.1国内外聊天系统的研究现状 (4)

1.2J A V A语言 (6)

1.2.1 Java的发展历史 ............................................................................... - 6 -

1.2.2 Java的特点 ....................................................................................... - 6 -

1.2.3 Java与Internet .................................................................................. - 7 - 1.3S OCKET编程 (7)

1.3.1 关于TCP/IP协议............................................................................. - 7 -

1.3.2 服务器和客户机.................................................. 错误！未定义书签。

1.4本文内容安排 (9)

2 需求分析............................................................................................................................. - 9 - 2.1可行性研究 ................................................................ 错误！未定义书签。

2.1.1 可行性分析....................................................................................... - 9 -

2.1.2系统功能需求.................................................................................. - 10 -

2.1.3 系统性能需求................................................................................. - 10 -

2.1.4 系统运行需求............................................................................... - 11 - 2.2数据流图 (11)

2.2.1 顶层数据流图................................................................................. - 11 -

2.2.2 一层数据流图............................................................................... - 11 -

2.2.3 二层数据流图............................................................................... - 13 -

3 概要设计........................................................................................................................... - 1

4 -